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首页> 外文期刊>Composite Structures >An improved model for the prediction of intra-cell buckling in CFRP sandwich panels under in-plane compressive loading
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An improved model for the prediction of intra-cell buckling in CFRP sandwich panels under in-plane compressive loading

机译：平面压缩载荷作用下CFRP夹芯板胞内屈曲预测的改进模型

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Local instability in the form of "intra-cell buckling" or "dimpling" is a well-known failure mode in honeycomb-cored sandwich panels with very thin faces. Most work reported on the subject suggests relatively simple design formulae for the estimation of the intra-cell buckling load. It is however widely known that these classical design formulae in some cases considerably underpredict the intra-cell buckling load. In this paper a series of experimental results obtained for different CFRP/honeycomb sandwich panel configurations loaded in compression are presented. The results confirm that the "classical" design formulae provide overly conservative results. During the tests the intra-cell buckling patterns were monitored carefully, and it was observed that the hitherto assumed buckling patterns did not correspond to the experimental observations. Based on these findings a new simplified design formula is suggested, which for the investigated CFRP/honeycomb sandwich panels provides significantly more accurate predictions than the "classical" design formulae.
机译：在具有非常薄的表面的蜂窝芯夹芯板中，以“单元内弯曲”或“凹陷”形式的局部不稳定性是众所周知的失效模式。关于该主题的大多数工作都提出了相对简单的设计公式，用于估算单元内屈曲载荷。然而，众所周知，这些经典设计公式在某些情况下大大低估了单元内屈曲载荷。在本文中，介绍了在压缩条件下加载的不同CFRP /蜂窝夹芯板配置获得的一系列实验结果。结果证实“经典”设计公式提供了过于保守的结果。在测试期间，仔细地监测了细胞内的屈曲模式，并且观察到迄今为止假定的屈曲模式与实验观察结果不符。基于这些发现，提出了一个新的简化设计公式，该公式对于所研究的CFRP /蜂窝夹芯板比“经典”设计公式提供了更为准确的预测。

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